Updated openstack/openstack
Project: openstack/nova  addb0023d1815b1d45cd25b0f707a4836fe1364e
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Extend LibvirtConfigGuest to parse guest cpu element info

Add support for LibvirtConfigGuest to parse LibvirtConfigGuestCPU,
parse CPU element 'mode' and 'match' from dom. This is the first
step to improve live migration CPU compare check.

Change-Id: Iab92b38afeade9876be391584e4e41864641134a